|Title||Observation of a Many-Body Dynamical Phase Transition with a 53-Qubit Quantum Simulator|
|Publication Type||Journal Article|
|Year of Publication||2017|
|Authors||Zhang, J, Pagano, G, Hess, PW, Kyprianidis, A, Becker, P, Kaplan, H, Gorshkov, AV, Gong, Z-X, Monroe, C|
A quantum simulator is a restricted class of quantum computer that controls the interactions between quantum bits in a way that can be mapped to certain difficult quantum many-body problems. As more control is exerted over larger numbers of qubits, the simulator can tackle a wider range of problems, with the ultimate limit being a universal quantum computer that can solve general classes of hard problems. We use a quantum simulator composed of up to 53 qubits to study a non-equilibrium phase transition in the transverse field Ising model of magnetism, in a regime where conventional statistical mechanics does not apply. The qubits are represented by trapped ion spins that can be prepared in a variety of initial pure states. We apply a global long-range Ising interaction with controllable strength and range, and measure each individual qubit with near 99% efficiency. This allows the single-shot measurement of arbitrary many-body correlations for the direct probing of the dynamical phase transition and the uncovering of computationally intractable features that rely on the long-range interactions and high connectivity between the qubits.